McMaster Item #4293T76 Wide-Mouth Rectangular Polyethylene Bottle 4 oz, 2-3/8" X 1-1/2" Base, 4" Overall Height $ 1.30 Each

The UAT fittings have some sort of red thread locker on them. I used red Loctite 271 when I rebuilt one of mine. It's had fuel in it now for about 3 weeks and hasn't leaked.